@Shep Sheppard​ Can you share you cluster spark configuration, storage credential and external location configurations. Please mask the sensitive data. Do you initialize storage using any of below spark configurations, notebook or any init script? If so, please remove them

spark.conf.set("fs.azure.account.auth.type.<storage-account>.dfs.core.windows.net", "OAuth")

spark.conf.set("fs.azure.account.oauth.provider.type.<storage-account>.dfs.core.windows.net", "org.apache.hadoop.fs.azurebfs.oauth2.ClientCredsTokenProvider")

spark.conf.set("fs.azure.account.oauth2.client.id.<storage-account>.dfs.core.windows.net", "<application-id>")

spark.conf.set("fs.azure.account.oauth2.client.secret.<storage-account>.dfs.core.windows.net", service_credential)

spark.conf.set("fs.azure.account.oauth2.client.endpoint.<storage-account>.dfs.core.windows.net", "https://login.microsoftonline.com/<directory-id>/oauth2/token")

spark.conf.set("fs.azure.account.auth.type.<storage-account>.dfs.core.windows.net", "SAS")

spark.conf.set("fs.azure.sas.token.provider.type.<storage-account>.dfs.core.windows.net", "org.apache.hadoop.fs.azurebfs.sas.FixedSASTokenProvider")

spark.conf.set("fs.azure.sas.fixed.token.<storage-account>.dfs.core.windows.net", "<token>")

spark.conf.set(

"fs.azure.account.key.<storage-account>.dfs.core.windows.net",

dbutils.secrets.get(scope="<scope>", key="<storage-account-access-key>"))